Quite often, in cases where an accused has challenged a confession as having been forced from him under torture, the initial investigation has foundered because those who might have been responsible cannot be identified.
En casos en que el procesado ha impugnado la confesión por haber sido forzado a ella mediante tortura, ha sido frecuente que la averiguación previa no haya prosperado por la imposibilidad de identificar a los posibles autores.